import json
import logging
from datetime import datetime, timezone
from typing import cast

from flask_login import current_user
from flask_sqlalchemy.pagination import Pagination

from configs import dify_config
from constants.model_template import default_app_templates
from core.agent.entities import AgentToolEntity
from core.app.features.rate_limiting import RateLimit
from core.errors.error import LLMBadRequestError, ProviderTokenNotInitError
from core.model_manager import ModelManager
from core.model_runtime.entities.model_entities import ModelPropertyKey, ModelType
from core.model_runtime.model_providers.__base.large_language_model import LargeLanguageModel
from core.tools.tool_manager import ToolManager
from core.tools.utils.configuration import ToolParameterConfigurationManager
from events.app_event import app_was_created
from extensions.ext_database import db
from models.account import Account
from models.model import App, AppMode, AppModelConfig
from models.tools import ApiToolProvider
from services.tag_service import TagService
from tasks.remove_app_and_related_data_task import remove_app_and_related_data_task


class AppService:
    def get_paginate_apps(self, tenant_id: str, args: dict) -> Pagination | None:
        """
        Get app list with pagination
        :param tenant_id: tenant id
        :param args: request args
        :return:
        """
        filters = [
            App.tenant_id == tenant_id,
            App.is_universal == False
        ]

        if args['mode'] == 'workflow':
            filters.append(App.mode.in_([AppMode.WORKFLOW.value, AppMode.COMPLETION.value]))
        elif args['mode'] == 'chat':
            filters.append(App.mode.in_([AppMode.CHAT.value, AppMode.ADVANCED_CHAT.value]))
        elif args['mode'] == 'agent-chat':
            filters.append(App.mode == AppMode.AGENT_CHAT.value)
        elif args['mode'] == 'channel':
            filters.append(App.mode == AppMode.CHANNEL.value)

        if args.get('name'):
            name = args['name'][:30]
            filters.append(App.name.ilike(f'%{name}%'))
        if args.get('tag_ids'):
            target_ids = TagService.get_target_ids_by_tag_ids('app',
                                                              tenant_id,
                                                              args['tag_ids'])
            if target_ids:
                filters.append(App.id.in_(target_ids))
            else:
                return None

        app_models = db.paginate(
            db.select(App).where(*filters).order_by(App.created_at.desc()),
            page=args['page'],
            per_page=args['limit'],
            error_out=False
        )

        return app_models

    def create_app(self, tenant_id: str, args: dict, account: Account) -> App:
        """
        Create app
        :param tenant_id: tenant id
        :param args: request args
        :param account: Account instance
        """
        app_mode = AppMode.value_of(args['mode'])
        app_template = default_app_templates[app_mode]

        # get model config
        default_model_config = app_template.get('model_config')
        default_model_config = default_model_config.copy() if default_model_config else None
        if default_model_config and 'model' in default_model_config:
            # get model provider
            model_manager = ModelManager()

            # get default model instance
            try:
                model_instance = model_manager.get_default_model_instance(
                    tenant_id=account.current_tenant_id,
                    model_type=ModelType.LLM
                )
            except (ProviderTokenNotInitError, LLMBadRequestError):
                model_instance = None
            except Exception as e:
                logging.exception(e)
                model_instance = None

            if model_instance:
                if model_instance.model == default_model_config['model']['name'] and model_instance.provider == default_model_config['model']['provider']:
                    default_model_dict = default_model_config['model']
                else:
                    llm_model = cast(LargeLanguageModel, model_instance.model_type_instance)
                    model_schema = llm_model.get_model_schema(model_instance.model, model_instance.credentials)

                    default_model_dict = {
                        'provider': model_instance.provider,
                        'name': model_instance.model,
                        'mode': model_schema.model_properties.get(ModelPropertyKey.MODE),
                        'completion_params': {}
                    }
            else:
                default_model_dict = default_model_config['model']

            default_model_config['model'] = json.dumps(default_model_dict)

        app = App(**app_template['app'])
        app.name = args['name']
        app.description = args.get('description', '')
        app.mode = args['mode']
        app.icon = args['icon']
        app.icon_background = args['icon_background']
        app.tenant_id = tenant_id
        app.api_rph = args.get('api_rph', 0)
        app.api_rpm = args.get('api_rpm', 0)

        db.session.add(app)
        db.session.flush()

        if default_model_config:
            app_model_config = AppModelConfig(**default_model_config)
            app_model_config.app_id = app.id
            db.session.add(app_model_config)
            db.session.flush()

            app.app_model_config_id = app_model_config.id

        db.session.commit()

        app_was_created.send(app, account=account)

        return app

    def get_app(self, app: App) -> App:
        """
        Get App
        """
        # get original app model config
        if app.mode == AppMode.AGENT_CHAT.value or app.is_agent:
            model_config: AppModelConfig = app.app_model_config
            agent_mode = model_config.agent_mode_dict
            # decrypt agent tool parameters if it's secret-input
            for tool in agent_mode.get('tools') or []:
                if not isinstance(tool, dict) or len(tool.keys()) <= 3:
                    continue
                agent_tool_entity = AgentToolEntity(**tool)
                # get tool
                try:
                    tool_runtime = ToolManager.get_agent_tool_runtime(
                        tenant_id=current_user.current_tenant_id,
                        app_id=app.id,
                        agent_tool=agent_tool_entity,
                    )
                    manager = ToolParameterConfigurationManager(
                        tenant_id=current_user.current_tenant_id,
                        tool_runtime=tool_runtime,
                        provider_name=agent_tool_entity.provider_id,
                        provider_type=agent_tool_entity.provider_type,
                        identity_id=f'AGENT.{app.id}'
                    )

                    # get decrypted parameters
                    if agent_tool_entity.tool_parameters:
                        parameters = manager.decrypt_tool_parameters(agent_tool_entity.tool_parameters or {})
                        masked_parameter = manager.mask_tool_parameters(parameters or {})
                    else:
                        masked_parameter = {}

                    # override tool parameters
                    tool['tool_parameters'] = masked_parameter
                except Exception as e:
                    pass

            # override agent mode
            model_config.agent_mode = json.dumps(agent_mode)

            class ModifiedApp(App):
                """
                Modified App class
                """
                def __init__(self, app):
                    self.__dict__.update(app.__dict__)

                @property
                def app_model_config(self):
                    return model_config
                
            app = ModifiedApp(app)

        return app

    def update_app(self, app: App, args: dict) -> App:
        """
        Update app
        :param app: App instance
        :param args: request args
        :return: App instance
        """
        app.name = args.get('name')
        app.description = args.get('description', '')
        app.max_active_requests = args.get('max_active_requests')
        app.icon = args.get('icon')
        app.icon_background = args.get('icon_background')
        app.updated_at = datetime.now(timezone.utc).replace(tzinfo=None)
        db.session.commit()

        if app.max_active_requests is not None:
            rate_limit = RateLimit(app.id, app.max_active_requests)
            rate_limit.flush_cache(use_local_value=True)
        return app

    def update_app_name(self, app: App, name: str) -> App:
        """
        Update app name
        :param app: App instance
        :param name: new name
        :return: App instance
        """
        app.name = name
        app.updated_at = datetime.now(timezone.utc).replace(tzinfo=None)
        db.session.commit()

        return app

    def update_app_icon(self, app: App, icon: str, icon_background: str) -> App:
        """
        Update app icon
        :param app: App instance
        :param icon: new icon
        :param icon_background: new icon_background
        :return: App instance
        """
        app.icon = icon
        app.icon_background = icon_background
        app.updated_at = datetime.now(timezone.utc).replace(tzinfo=None)
        db.session.commit()

        return app

    def update_app_site_status(self, app: App, enable_site: bool) -> App:
        """
        Update app site status
        :param app: App instance
        :param enable_site: enable site status
        :return: App instance
        """
        if enable_site == app.enable_site:
            return app

        app.enable_site = enable_site
        app.updated_at = datetime.now(timezone.utc).replace(tzinfo=None)
        db.session.commit()

        return app

    def update_app_api_status(self, app: App, enable_api: bool) -> App:
        """
        Update app api status
        :param app: App instance
        :param enable_api: enable api status
        :return: App instance
        """
        if enable_api == app.enable_api:
            return app

        app.enable_api = enable_api
        app.updated_at = datetime.now(timezone.utc).replace(tzinfo=None)
        db.session.commit()

        return app

    def delete_app(self, app: App) -> None:
        """
        Delete app
        :param app: App instance
        """
        db.session.delete(app)
        db.session.commit()

        # Trigger asynchronous deletion of app and related data
        remove_app_and_related_data_task.delay(
            tenant_id=app.tenant_id,
            app_id=app.id
        )

    def get_app_meta(self, app_model: App) -> dict:
        """
        Get app meta info
        :param app_model: app model
        :return:
        """
        app_mode = AppMode.value_of(app_model.mode)

        meta = {
            'tool_icons': {}
        }

        if app_mode in [AppMode.ADVANCED_CHAT, AppMode.WORKFLOW]:
            workflow = app_model.workflow
            if workflow is None:
                return meta

            graph = workflow.graph_dict
            nodes = graph.get('nodes', [])
            tools = []
            for node in nodes:
                if node.get('data', {}).get('type') == 'tool':
                    node_data = node.get('data', {})
                    tools.append({
                        'provider_type': node_data.get('provider_type'),
                        'provider_id': node_data.get('provider_id'),
                        'tool_name': node_data.get('tool_name'),
                        'tool_parameters': {}
                    })
        else:
            app_model_config: AppModelConfig = app_model.app_model_config

            if not app_model_config:
                return meta

            agent_config = app_model_config.agent_mode_dict or {}

            # get all tools
            tools = agent_config.get('tools', [])

        url_prefix = (dify_config.CONSOLE_API_URL
                      + "/console/api/workspaces/current/tool-provider/builtin/")

        for tool in tools:
            keys = list(tool.keys())
            if len(keys) >= 4:
                # current tool standard
                provider_type = tool.get('provider_type')
                provider_id = tool.get('provider_id')
                tool_name = tool.get('tool_name')
                if provider_type == 'builtin':
                    meta['tool_icons'][tool_name] = url_prefix + provider_id + '/icon'
                elif provider_type == 'api':
                    try:
                        provider: ApiToolProvider = db.session.query(ApiToolProvider).filter(
                            ApiToolProvider.id == provider_id
                        ).first()
                        meta['tool_icons'][tool_name] = json.loads(provider.icon)
                    except:
                        meta['tool_icons'][tool_name] = {
                            "background": "#252525",
                            "content": "\ud83d\ude01"
                        }

        return meta
